BESTEK Mini Dehumidifier with Moisture Indicator for Cabinets, Closets, Book Shelves, Gym Bags, Washing Machines, Kitchen Room, Bathrooms, etc (Renewable, Wireless, Compact, 150ml Capacity) Works w/Silica Gel: No batteries or plug-in power needed (while operating). Renewable by plugging in wall AC outlet to recharge crystals. An indicator window shows color changing of the inside crystals. Spill- & Mess-free, non toxic, and child- & pet-safe. Non-toxic, safe and silent punch to get rid of excessive humidity.